Truck concrete mixer



July 19, 1932. JAEGER 1,867,838

TRUCK CONCRETE MIXER Filed Nov. 30. 1928 2 Sheets-Sheet l i '1 M s l $1 can i g d E IllIIIHHHHHHHHIIHIIIIHHH I g9 an l R Q 8 Fl s ll \I I1 [I a n g? m Bummer GEBHARD JAEGER July 19, 1932. ER 1,867,838

TRUCK CONCRETE MIXER Filed Nov. 30, 1928 2 Sheets-Sheet 2 Y 2L LLO Ismaeutor GEBHARD JAEGER my-improved means for mixing the concrete.

Patented July 19, 1932.

UNITED STATES PATENT OFFICE GEBHABD LARGER, OI COLUMBUS, OHIO, ASSIGNOB TO THE JAEGEB MACHINE COMI- rm, OI COLUMBUS, OHIO, A CORPORATION 01' OHIO TRUCK CONCRETE MIXER -'A 11cation filed November so, 1928. Serial no; 322,640.

This invention relates to a combined transporting and mixing truck for concrete and more especially for taking the unmixed materials of the concrete from'a point of supply and mixing them during transit to or at the shaft 0 point of deposit.

One object of the invention is more es cially to rovide an improved and simpli ed mixing um having a cylindrical portion terminating in a' tapered discharge for a motor driven truck and means for mounting and rotating the same on a fixed horizontal axis on such truck whereby the concrete materials can be effectively mixed when the.

drum is rotated in one direction and the discharge of the materials caused by rotation of the drum in the opposite direction. Other objects of the invention will appear from the disclosure herein.

Theinvention is embodied in the example herein shown and described, the features of novelty being finally claimed.

In the accompanying drawings?- Figure 1 is a view in side elevation and partly in section and with some parts broken out and removed showing the ..truck mixer according to my invention.

Fig. 2 is a plan view' of frame containing the means for supporting and rotating the mixing drum.

Fig. 3 is a central longitudinal sectional viewof the mixing drum showing in full'view material.

Fig. 4 is an elevation of the of the mixing drum.

Fig. 5 is a transverse section. of the mixing drum on the line V-V Fig. 3.

Fig. 6 is a view like Fig.4 showing a removable cover applied thereto. I

Fig. 7 is a central vertical sectio'n on the line VIL-VII Fig. 6.

Fig 8 is a section like Fig. 7 showing a removable funnel substituted for the cover.

In the views 10 designates the truck, it consisting of any suitable motor vehicle and containing an engine, the propeller shaft 11 of which extends to a differential gear at the rear for driving the rear wheels, a clutch operated by a foot lever 12, a gear shift lever the chassis or truck discharge end 13 for controlling the usual change speed and reversing gear in'box 14.

In additionto these parts .there is in the present construction a power take-01f shaft 16 adapted to beoperated from the crank the engine and gears in the box. In the present instance the power take-off is geared to turn in one direction.

21 designates the mixing drum which is supported in rear of the drivers seat to rotate as hereinafter described on a forward pair of flanged rollers 18 and rear pair of rollers 18*, said rollers being journaled in stout saddles 19 and 19 respectively, secured transversely on the=truck frame 20. In the example shown the drum 21 is mounted on its said supporting rollers with its axis parallel to the truck frame. The main body of the drum is cylindrical in form terminating at its rear in a tapered ortion 21 which is open for charging and ischarging.

The forward end of the drum is closed and 1 its rear open end may be provided with a movable cover 21 bayonet-1y joined thereto to prevent accidental spilling of some of the 9 contents. The drum is supplied with the dry concrete materials to be mixed through thedischarge end which may have attached to it for the purpose afunnel 22 secured in the same manner as the cover 21'. The drum is provided with projecting peripheral track bands 23 and 23 to rest the travel on the rollers 18 and 18 respectively; and because said rollers are flanged the drum is securely positioned thereon against longitudinal movement as respects the truck frame.

The forward end of the drum is provided with a peripheral gear rack 25 engaged by a pinion 26 fixed 'on a shaft 26 journaled in suitable hearings on saddles between the" truck sills. Journaled in said saddles parallel to said shaft 26- is a shaft 27 having secured thereon a sprocket wheel 28 connected with and driven by a sprocket wheel 29 fixed on the power take-off shaft 16. Loose on the shaft 26 is a sleeve 30 having a clutch jaw at its rear end and a sprocket wheel on which is a sprocket chain 31 driven by a sprocket wheel fixed on the shaft 27; and also loose on said shaft 26 is a spur gear 32 having a s ur gear 33 to engage the gear 32. Slida le on said shaft 26 between said clutch jaws but splined to said shaft so as to rotate therewith is a double clutch 34 adapted to he slid into engagement with either of aforesaid clutch jaws or to occupy a neutral or inactive position between them.

The double clutch has a medial annular groove in which is received a lever 35 pivoted at 36 on the right hand truck sill, the free end of said lever being connected by a rod 37 with a hand lever 38 pivoted at 39 on the left hand truck sill so that said lever 35, if not otherwise prevented as hereinafter described, can be employed to shift the double clutch'to engage one or the other of said clutch jaws or to occupy a neutral position.

From the mechanism just described it will be plain that the spur gear 26, and therefore the mixing drum, can be driven by the power shaft in one direction by shifting the double clutch to engage the clutch jaw of the sprocket wheel or in the opposite direction by shifting said double clutch to engage the clutch jaw of the spur gear and that when the double clutch is left in the neutral position no rotation of the gear 26 or the drum is effected notwithstanding constant operation of the engine of the power take-off shaft and shaft 27 in one direction,

The interior of the drum is provided with two continuous spiral blades 40 that are diametrically spaced apart and peripherally connected with the interior wall of the drum. These spiral blades are each arranged to move the material toward the forward or closed end of the drum when turned in one direction and conversely to move the material toward the rear or open end of the drum when turned in the oppositedirection. Obviously the blades can be turned in the direction to move the material toward the rear with the closure closing the discharge opening so that by operating the drum in either direction or both directions successively a mixing effect is obtained. These blades in the cylindrical portion of the drum are of a width considerably less than half a radius of the drum but These wider portions of the blades not only accelerate charging operation but also accelerate the discharge of the materials from the drum when the rotation of the drum is reversed for the purpose of effecting such dis- I charge. In the forward part of the drum and secured to the head thereof is a blade or baffle 42 of substantially rectangular form and having a flange 42, said blade being set at an incline to the axis of the drum and extending forwardly intothe drum beyond the forward terminals of the two spiral blades so that periodically, during the mixing rotations of the drum, the material slides rearwardly ofl said bafile blade onto the spiral blades and into the space between the spiral blades that are advancing the material forwardly. This inclined blade is supported at 7 its rear corners by rods 43, 43, that cut through the material as it falls from the rising side of the drum and thus aid in the mixing effect. Water can be supplied to the dry materials in the drum through a pipe extending through a hole in the forward head of the drum at its axis.

From the construction shown it is obvious that the mixing operation can be performed either while the vehicle is in transit or while standing still and while still it may be performed either at the point of supply of the unmixed material, at intermediate points or at the point of deposit. In many instances it will be more advantageous to mix in transit so that the discharge may be made without delay.

It will be further noted that with this construction the mixing drum can be formed as a cylindrical drum with a tapering central discharge at one end and into which the mixing elements of enlarged width extend. When so made the mixing drum can be mounted to turn on a stationary horizontal axis and the discharge quickly effected without changing the position of the axis -of the drum. The widened mixing elements in the tapered portion thus cause the materials to move up hill out of the horizontal portion of the drum. Furthermore the drum can be charged at the charging opening the widened blades quickening the supplying of the mixture or its ingredients to the cylindrical portion of the drum.

The forms of the parts can be changed without departing from the gist of the invention as claimed.

What I claim is:

1. A mixing drum for a truck concrete mixer having an open discharge end portion, a spiral blade in said drum having an increased width near said discharge end and a supplemental mixing blade at the opposite end of the drum.

2. A mixing drum for a concrete mixer having an open discharge end portion, a spiral blade in said drum having an increased width near said discharge end and a supplemental mixing blade at the opposite end/of the drum, said mixing blade inclined to the having an open discharge end portion, a

spiral blade in drum having an increased width near said discharge end and a supplemental mixing blade at the opposite end of the drum extending rearward beyond the forward terminal of the spiral blade.

4. A mixing drum for a concrete mixer having an open discharge end, a pair of spaced spiral blades in said drum having an increased width near the discharge end and a supplemental blade at the other end of the drum adapted to deposit material onto the narrower portions of the spiral blades.

5. A mixing drum for a concrete mixer having an open discharge end, a pair'of spaced spiral blades in said drum having an increased Width near the discharge end and supplemental blade inclined to the axis of the drum at the otherend of the drum adapted to deposit material onto the narrower portions of the spiral blades.

6. A concrete mixing drum consisting of a cylindrical mixing portion terminating at its rear end in a i'rusto-conical discharging portion, a spirally arranged mixing blade in said cylindrical portion, and an inclined baiile blade secured in the forward portion of said cylindrical portion of the drum to cascade the concrete materials rearwardly onto said spiral blade and a discharging blade portion in said frusto-conical portion, and means whereby said drum when mounted on a substantially horizontal axis may be turned in one direction to mix the concrete materials and in the opposite direction to discharge the same.

7. A concrete mixing drum consisting of a cylindrical mixing portion terminating at its rear end in a frusto-conical dischar ing portion, a spirally arranged mixing bla e in said cylindrical portion, and an inclined b2 5 a blade provided with a flange secured in the forward portion of said cylindrical portion of the drum to cascade the concrete materials rearwardly onto said blade and a spiral discharging blade portion in said frusto-conical portion, and means'whereby said drum when mounted on a substantially horizontal axis may be turned in one direction to mix the concrete materials and in the opposite direction to discharge the same GEBHARD JAEGER. 

